9 UL Standards
48 YASKAWA ELECTRIC TOEP C710616 27D YASKAWA AC Drive - A1000 Quick Start Guide
Enable the motor overload protection (L1-01 = 1 to 5) when connecting the drive to a single motor, unless another motor
overload preventing device is installed. The drive electronic thermal overload function causes an oL1 fault, which shuts
off the output of the drive and prevents additional overheating of the motor. The motor temperature is continually
calculated as long as the drive is powered up.
L1-02 Motor Overload Protection Time
Setting Range: 0.1 to 5.0 min
Factory Default: 1.0 min
Parameter L1-02 determines how long the motor is allowed to operate before the oL1 fault occurs when the drive is
running at 50 Hz and at 150% of the full load amp rating (E2-01) of the motor. Adjusting the value of L1-02 can shift the
set of oL1 curves up the y axis of the diagram below, but will not change the shape of the curves.
Precautionary Notes on External Heatsink (IP00 Enclosure)
When using an external heatsink, UL compliance requires that exposed capacitors in the main circuit are covered to
prevent injury to surrounding personnel.
The portion of the external heatsink that projects out can either be protected with the enclosure, or with the appropriate
capacitor cover after drive installation is complete. Use the table below to match drive models and capacitor cover.
Capacitor covers can be ordered from a Yaskawa representative or directly from the Yaskawa sales department. The table
below lists available capacitor covers.
10
7
3
1
0.4
0.1
0 100 200150
Cold Start
Hot Start
Motor Current (%)
(E2-01=100 %)
Time (min)
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